How Can I use EL in JSF

Dear All
I want to add If condition in JSF page .
How can I use EL at JSF page
I want ot Add If condition .
With Thanks and Regards
Gunjan Bohra

Actually By Problem Is Regarding DataTable Binding Method
<f:subview id="vesselist" rendered="#{vesselBaseVO.dfsVO.dfsData.dfsResultBeanListSize>0}" >
      <t:dataTable value="#{vesselBaseVO.dfsVO.dfsData.dfsResultBeanList}"
                          sortable="false"
                          var="result"
                          id="dfsTable"
                           forceId="true"
                          rowClasses="AlternateRow1, AlternateRow2"
                          columnClasses="TableColumnText, TableColumnText, TableColumnText, TableColumnText, TableColumnText, TableColumnText, TableColumnText, TableColumnNumber, TableColumnNumber, TableColumnText"
                          headerClass="TableHeader"
                          frame="box"
                          width="100%"
                          preserveDataModel="false"
                          rows="10" binding="#{vesselBackingBean.searchResultDataTable}" rendered="true">
         </t:dataTable>
</f:subview>Although I had block it with renderer attribute ,
DataTable would not show if resultList size is 0 but
DATA Table binding method is still called even dataTable is not rendered on page I want to block that binding method calling ...
How can I do that !!!!

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